The general effect of the terminal and its role is low voltage cable , electrical wire access device (usually a transformer , boxes, cabinets ) when connecting fittings .
Terminals and applications in order to WISDOM HDMI CABLE facilitate wire connection, it is actually inside some enclosed in insulating plastic sheet metal , wire can be inserted into the hole at each end , for tightening or loosening screws , such as two wires , sometimes need to be connected , and sometimes you need to disconnect , then you can use the terminal to connect them , and you can disconnect at any time , without having to weld them together or intertwined , it is quick and easy. And is suitable for a large number of interconnected wires in the power industry have a special terminal block , terminal box , above all terminals, a single layer , double layer , current, voltage , ordinary, can be broken and so on. A crimp in order to ensure WISDOM hdmi wall plate reliable contact with the area , and to ensure a sufficient current through .
Terminal is used to achieve a accessories electrical connection , the connector into the scope of the industry . With the increasingly high level of industrial automation and industrial control requirements become more stringent , precise dosage terminals gradually rise. With the development of the electronics industry, the use of the terminal more and more , and more and more types . Currently the most widely used in addition to the PCB terminal , there are hardware terminals , screw terminals , spring terminals and so on.
Terminal is actually a connector , which WISDOM VGA CABLE is to facilitate the application of the wire connection, it really is a piece of plastic inside sealed in insulated metal sheet has holes at both ends of the wire can be inserted , or loose screws for fastening open , such as the two wires , and sometimes need to be connected , and sometimes you need to disconnect , then you can use the terminal to connect them , and you can disconnect at any time , without having to weld them together or intertwined , it is quick and easy.
terminal block
2014年1月25日星期六
2014年1月24日星期五
terminal block screw connection technology
With the advent of modular terminal blocks, screw technology occupy a major position in the industrial control systems. Compared screw connection, other connection technologies can not provide such a large pressing force in such a small space. Self-locking system prevents accidental screw loose connections. Operation is very simple, just a WISDOM VGA CABLE screwdriver, you can complete the operation terminal screws and bridging pieces. Due to the high quality of the contact material, even in harsh environments, such as aggressive air and can maintain long-term reliability. Screw indispensable in large current occasions. Terminal blocks 240mm2 can carry over 400A operating current.
Screw terminals are the most widely used in various fields of terminals, withstood the rigors of a variety of environments: either in the ocean or a plateau, either tropical or -40 ℃ low temperature, Stendhal screw terminals are reliable and stable to work with. Excellent product quality created such excellent performance:
Screw terminal metal parts made WISDOM Network Cabinet from high strength copper alloy of copper, the copper current bar made by the clamp body resistance to stress corrosion cracks in the copper alloy. Metal copper to ensure good electrical conductivity and corrosion resistance, and also to the same copper wire material to avoid due to differences in thermal expansion coefficient of the material to produce different degrees of thermal expansion, thus avoiding the loose.
Contact pressure is high, access to reliable variety of measures to ensure the reliable contact: Lift Drum principle ensures minimal contact resistance, the principle of self-locking screws to prevent terminal screws from loosening the clamp flat bottom surface can guaranteeWISDOM Mini HDMI cable a very fine wire is clamped;
Wire without pretreatment screw terminals can produce up to several hundred Newtons contact pressure, this pressure can be reliably single, stranded and fine-stranded conductors pressed without the use of wire end ferrules and copper crimp ends; highest VO flammability rating of housing material nylon insulated shell made of thermoplastic material, 6.6, flame retardant grade, safe and
Rely on.
Screw terminals are the most widely used in various fields of terminals, withstood the rigors of a variety of environments: either in the ocean or a plateau, either tropical or -40 ℃ low temperature, Stendhal screw terminals are reliable and stable to work with. Excellent product quality created such excellent performance:
Screw terminal metal parts made WISDOM Network Cabinet from high strength copper alloy of copper, the copper current bar made by the clamp body resistance to stress corrosion cracks in the copper alloy. Metal copper to ensure good electrical conductivity and corrosion resistance, and also to the same copper wire material to avoid due to differences in thermal expansion coefficient of the material to produce different degrees of thermal expansion, thus avoiding the loose.
Contact pressure is high, access to reliable variety of measures to ensure the reliable contact: Lift Drum principle ensures minimal contact resistance, the principle of self-locking screws to prevent terminal screws from loosening the clamp flat bottom surface can guaranteeWISDOM Mini HDMI cable a very fine wire is clamped;
Wire without pretreatment screw terminals can produce up to several hundred Newtons contact pressure, this pressure can be reliably single, stranded and fine-stranded conductors pressed without the use of wire end ferrules and copper crimp ends; highest VO flammability rating of housing material nylon insulated shell made of thermoplastic material, 6.6, flame retardant grade, safe and
Rely on.
2014年1月23日星期四
Quality issues related to the motor terminal block
Generally, a three-phase motor quality terminals terminal manufacturers
in their mutual distance between the factory is set up in accordance with
rules of order made , the insulation distance should meet the
requirements, if the terminal rack intact , not because of the distance
put enough arc caused by a short circuit. To analyze this failure in the
motor terminal box to maintain the WISDOM RAC CABLE integrity of the premise, there are two
issues should be considered when one is burned at the terminal , there is
no burn out the motor coils , electrical coils are all intact , then the
problem of the whole in terms of the quality terminals , the second is
when the motor coil terminals burned another injury , then again is
another matter.
If this high-quality motor terminals are in use for some time before
stopping , then damp possibility lugs oxidation is relatively large,
burned to generate heat due to poor contact caused . If the motor runs
frequently appeared in the operation of the terminal burned, should
determine the cause of the terminal bolts loose , and the temperature must
be accumulated over time, coupled with WISDOM HDMI CABLE increased humidity in air , surface
oxidation of high-quality terminals will also be cause contact resistance
increases , up to a certain extent , this phenomenon deteriorating faster
and faster , in the junction box complete , the generally difficult to
find , culminating in this failure. So the WISDOM hdmi wall plate general operating requirements
of electrical equipment also has provisions regular inspection and
inspections are a good way to reduce the failure , there is the
opportunity to stop , open the box and check can detect early signs of
some failures .
in their mutual distance between the factory is set up in accordance with
rules of order made , the insulation distance should meet the
requirements, if the terminal rack intact , not because of the distance
put enough arc caused by a short circuit. To analyze this failure in the
motor terminal box to maintain the WISDOM RAC CABLE integrity of the premise, there are two
issues should be considered when one is burned at the terminal , there is
no burn out the motor coils , electrical coils are all intact , then the
problem of the whole in terms of the quality terminals , the second is
when the motor coil terminals burned another injury , then again is
another matter.
If this high-quality motor terminals are in use for some time before
stopping , then damp possibility lugs oxidation is relatively large,
burned to generate heat due to poor contact caused . If the motor runs
frequently appeared in the operation of the terminal burned, should
determine the cause of the terminal bolts loose , and the temperature must
be accumulated over time, coupled with WISDOM HDMI CABLE increased humidity in air , surface
oxidation of high-quality terminals will also be cause contact resistance
increases , up to a certain extent , this phenomenon deteriorating faster
and faster , in the junction box complete , the generally difficult to
find , culminating in this failure. So the WISDOM hdmi wall plate general operating requirements
of electrical equipment also has provisions regular inspection and
inspections are a good way to reduce the failure , there is the
opportunity to stop , open the box and check can detect early signs of
some failures .
2014年1月22日星期三
Resolve on terminal block rated voltage, rated current
With the innovative connection technology, more and more connectivity products are widely used in research and development by one, the common terminal on the market today have a rail terminal blocks, PCB terminal blocks, spring-type terminals, and so on. Shanghai Electric believes there is music in the operation of automated equipment, the terminal products go hand in hand like appearance, where the application circuit board terminals more widely. For the terminal itself, rated current, rated voltage ofWISDOM Network Cabinet two cognitive attributes is essential, there are two attributes do the music for this specific analysis:
Known voltage rated voltage, which is connected to the insulating material depends on the machine used, the size of the spacing between the contacts. Some components or devices at less than its rated voltage, may not fulfill its proper function. Rated voltage terminals should be understood as a matter of fact manufacturer recommended maximum operating voltage. In principle, the terminal row below the rated voltage can work. I tend According terminals withstand voltage (dielectric strength) indicators, in accordance with the use of the environment, the security level required for the rational use of the rated voltage. In other words, the same pressure indicators, depending on the use of environmental and safety requirements, can be used to different maximum operating voltage. It is also more in line with VGA CABLE the objective usage.
Rated current, also known as the operating current. With the rated voltage, as in the case below the rated current, terminals generally work well. In the terminal design process, is through terminals designed to meet the thermal requirements of the rated current, because the contact to have the current flows due to the presence of conductor resistance and contact resistance, exposure to heat will. When it exceeds a certain limit heat will destroy the insulation and terminals form contact softening of the surface coating, resulting in failure. Therefore, to limit the rated current, in fact, want to limit the terminal block inside temperature does not exceed the design value. In the choice of when to pay attention to the question is: for multi-core terminals, the rated current must be derated. This should cause a large current situations in importance, such as φ3.5mm exposure to the general provisions of the rated current of 50A, but in five core derated to 33% of the time used for each core is only rated current 38A, Number of cores The more, the greater derating.
Known voltage rated voltage, which is connected to the insulating material depends on the machine used, the size of the spacing between the contacts. Some components or devices at less than its rated voltage, may not fulfill its proper function. Rated voltage terminals should be understood as a matter of fact manufacturer recommended maximum operating voltage. In principle, the terminal row below the rated voltage can work. I tend According terminals withstand voltage (dielectric strength) indicators, in accordance with the use of the environment, the security level required for the rational use of the rated voltage. In other words, the same pressure indicators, depending on the use of environmental and safety requirements, can be used to different maximum operating voltage. It is also more in line with VGA CABLE the objective usage.
Rated current, also known as the operating current. With the rated voltage, as in the case below the rated current, terminals generally work well. In the terminal design process, is through terminals designed to meet the thermal requirements of the rated current, because the contact to have the current flows due to the presence of conductor resistance and contact resistance, exposure to heat will. When it exceeds a certain limit heat will destroy the insulation and terminals form contact softening of the surface coating, resulting in failure. Therefore, to limit the rated current, in fact, want to limit the terminal block inside temperature does not exceed the design value. In the choice of when to pay attention to the question is: for multi-core terminals, the rated current must be derated. This should cause a large current situations in importance, such as φ3.5mm exposure to the general provisions of the rated current of 50A, but in five core derated to 33% of the time used for each core is only rated current 38A, Number of cores The more, the greater derating.
2014年1月20日星期一
terminal block transformer industry in the application description and classification
Transformer is an electromagnetic induction interaction, changing the voltage, current and impedance devices. The main function of the transformer are: voltage conversion; current conversion, impedance conversion; isolation; regulator (magnetic saturation of the transformer) and the like.
Classification commonly used transformers can be summarized as follows: (a) by way of cooling: (1) dry-type transformers: to WISDOM VGA CABLE rely on natural air convection cooling or cooling fan increases, mostly for high-rise buildings, high-speed charging station and local lighting electricity, electronics lines and other small capacity transformers. (2) oil-immersed transformers: to rely on oil as a cooling medium, such as oil-immersed self-cooled, oil-cooled, water-cooled oil, forced oil circulation.
(B) the winding in the form of: (1) two-winding transformer: used to connect two power system voltage levels. (2) three-winding transformer: general area substation for power systems, connecting three WISDOM Network Cabinet voltage levels. (3) auto-transformers: used to connect different voltage power systems. Can also be used as an ordinary step-up or drop after the transformer. (C) by the core form of:
(1) core-type transformer: used for high-voltage power transformers. (2) amorphous alloy transformer: amorphous alloy core transformer is new magnetic materials, load current drops to about 80%, is the ideal energy-saving effect of distribution transformers, especially for rural and developing areas such as power grids lower load rate place. (3) shell-type transformers: Special transformers for high-current, such as mini usb cable electric transformers, welding transformers; or used in electronic equipment and television, radio and other power transformer Shanghai Hongzhi - box-type transformers. The new transformer terminals, terminals have been widely used in electrical and electronic engineering industries in the world: large transformers. Transformer terminals, taking into account the structural design easy wiring, screws securely connected features.
Classification commonly used transformers can be summarized as follows: (a) by way of cooling: (1) dry-type transformers: to WISDOM VGA CABLE rely on natural air convection cooling or cooling fan increases, mostly for high-rise buildings, high-speed charging station and local lighting electricity, electronics lines and other small capacity transformers. (2) oil-immersed transformers: to rely on oil as a cooling medium, such as oil-immersed self-cooled, oil-cooled, water-cooled oil, forced oil circulation.
(B) the winding in the form of: (1) two-winding transformer: used to connect two power system voltage levels. (2) three-winding transformer: general area substation for power systems, connecting three WISDOM Network Cabinet voltage levels. (3) auto-transformers: used to connect different voltage power systems. Can also be used as an ordinary step-up or drop after the transformer. (C) by the core form of:
(1) core-type transformer: used for high-voltage power transformers. (2) amorphous alloy transformer: amorphous alloy core transformer is new magnetic materials, load current drops to about 80%, is the ideal energy-saving effect of distribution transformers, especially for rural and developing areas such as power grids lower load rate place. (3) shell-type transformers: Special transformers for high-current, such as mini usb cable electric transformers, welding transformers; or used in electronic equipment and television, radio and other power transformer Shanghai Hongzhi - box-type transformers. The new transformer terminals, terminals have been widely used in electrical and electronic engineering industries in the world: large transformers. Transformer terminals, taking into account the structural design easy wiring, screws securely connected features.
2014年1月17日星期五
How to use the thermostat terminals
Terminals in the refrigerator thermostat temperature sensor on the environment through automatic temperature sampling, real-time monitoring, control circuit starts when the ambient temperature is higher than the control settings, you can set the control back to the poor. If the temperature is still up, when the temperature rose to limit alarm set points, start limit alarm function. When the temperature control can not be effectively controlled in order to prevent destruction of the device can also be WISDOM RAC CABLE stopped by tripping device functions continue to run. Mainly used in the power sector using a variety of low voltage switch cabinet, dry-type transformers, box-type substation temperatures and other related fields. Related information: temperature controller is based on the principle of pressure to push through and break contacts. It consists of a bellows, temperature of the (test tube), the eccentric wheel, a jog switch or the like to form a sealed system and a sensor signal power transfer system. Control methods are generally divided into two types; one is cooled by the temperature change is an object to be controlled, the use of the vapor pressure type temperature controller, and the other by the object to be cooled to temperature changes in control, the use of electronic temperature controller. Mechanical divided into: vapor pressure thermostat, liquid expansion thermostat, thermostat gas adsorption, metal expansion thermostat. Where the vapor pressure type thermostat is divided into: inflatable type, liquid-gas and liquid-filled hybrid type. Household air conditioners are in such a mechanical thermostat refrigerator thermostat mainly works
Action role vapor pressure bellows in the spring, the spring will be controlled by the control panel knobs, capillary in the refrigerator freezer, indoor cycling return air temperature react. When it is set to a temperature rise when the temperature of the capillary and the bellows expands refrigerant gas temperature, and elongation of the bellows against the spring force of the switch contact connected to the operation of the compressor case, the cooling system until they When the set temperature is reduced, temperature of the gas contraction, contraction of the bellows, together with the spring action, the switch in the off position, cutting off the motor of the compressor circuit. Repeating this operation, so as to achieve the purpose of temperature control. Electronic temperature controller
Electronic temperature controller WISDOM HDMI CABLE (resistance) to the resistor to measure the temperature of the method, the general platinum wire, copper, tungsten, and a semiconductor (thermistor) for the measuring resistor, the resistor has its advantages and indeed point. Most home air conditioning is a thermistor sensor. Thermistor temperature controller is based on the principle of a Wheatstone bridge made of a Wheatstone bridge. In BD plugged ends E, when the resistance bridge R1 × R4 = R2 × R3, the potential points A and C are equal, no current flows between the output terminals A and C, the thermal impedance of the resistor R1 increase with the size or decrease the ambient temperature changes, so that balance is destroyed, there is between the output current AC. Thus, when constituting the thermostat can easily be done by selecting the appropriate thermistor to changes in temperature and the temperature adjustment range.
Action role vapor pressure bellows in the spring, the spring will be controlled by the control panel knobs, capillary in the refrigerator freezer, indoor cycling return air temperature react. When it is set to a temperature rise when the temperature of the capillary and the bellows expands refrigerant gas temperature, and elongation of the bellows against the spring force of the switch contact connected to the operation of the compressor case, the cooling system until they When the set temperature is reduced, temperature of the gas contraction, contraction of the bellows, together with the spring action, the switch in the off position, cutting off the motor of the compressor circuit. Repeating this operation, so as to achieve the purpose of temperature control. Electronic temperature controller
Electronic temperature controller WISDOM HDMI CABLE (resistance) to the resistor to measure the temperature of the method, the general platinum wire, copper, tungsten, and a semiconductor (thermistor) for the measuring resistor, the resistor has its advantages and indeed point. Most home air conditioning is a thermistor sensor. Thermistor temperature controller is based on the principle of a Wheatstone bridge made of a Wheatstone bridge. In BD plugged ends E, when the resistance bridge R1 × R4 = R2 × R3, the potential points A and C are equal, no current flows between the output terminals A and C, the thermal impedance of the resistor R1 increase with the size or decrease the ambient temperature changes, so that balance is destroyed, there is between the output current AC. Thus, when constituting the thermostat can easily be done by selecting the appropriate thermistor to changes in temperature and the temperature adjustment range.
2014年1月14日星期二
Power cables electric field strength across
Wire and cable products for the insulation resistance of the cable insulation is mainly measured volume resistivity , surface resistivity measurements are not , and factors affecting the high-voltage cable insulation resistance value more, in practice there are four main factors greater impact on the insulation resistance coefficient . Temperature of the temperature rise , the insulation resistance coefficient decreased , which is due to RAC CABLE increased thermal motion , and the migration of ions produced has increased , the role of the voltage , the conduction current is formed by the ion motion is increased, and thus the insulation resistance drops .
Theory and practice shows that the insulation resistance decreased with increasing temperature coefficient of the exponential type, while the conductivity increases exponentially with the temperature increase of the power cable type encountered when the electric field strength at low electric field strength within the range of the ion migration increases with increasing field strength , proportional to the ion current and the electric field strength obey Ohm's law , when the electric field intensity is relatively high, with the increase of the ion mobility and electric field intensity is gradually increased from the linear trend becomes exponential , when there will be a lot closer to the breakdown of the electron mobility , then greatly reduce the insulation resistance coefficient . Withstand test voltage specified in the standard variety of wire and cable products for the mobility of ions in an electric field intensity increases in proportion with the stage , so the impact of the electric field strength of the insulation resistance coefficient reflects not come out , when do puncture test specimen samples when the electric field of the insulation resistance coefficient obviously reflects out. Effect of humidity due to the small conductance large, and the water molecules of the polymer molecule size much smaller than that in the thermal effect of the relative motion of the polymer chain composed of macromolecules HDMI CABLE and section within easy infiltration of water molecules on the polymer , so that an increase in the ionic conductivity of polymer , leaving the insulation resistance decreases. Standard provides a variety of water immersion test wire and cable , such as rubber specimen measuring insulation resistance before soaking for 24 hours, because its purpose is to be encountered in the use of water on the influence of moisture and electrical performance .
Insulation resistance is one of the main electrical performance insulation materials, wire and cable is an important indicator of a product or material , generally require insulation resistance of not less than a certain value. If the insulation resistance value is too low, the line along the wire cable must increase the leakage current , resulting in waste of energy , and electrical energy into heat energy , the thermal breakdown preparation conditions , increase the possibility of thermal breakdown .
Theory and practice shows that the insulation resistance decreased with increasing temperature coefficient of the exponential type, while the conductivity increases exponentially with the temperature increase of the power cable type encountered when the electric field strength at low electric field strength within the range of the ion migration increases with increasing field strength , proportional to the ion current and the electric field strength obey Ohm's law , when the electric field intensity is relatively high, with the increase of the ion mobility and electric field intensity is gradually increased from the linear trend becomes exponential , when there will be a lot closer to the breakdown of the electron mobility , then greatly reduce the insulation resistance coefficient . Withstand test voltage specified in the standard variety of wire and cable products for the mobility of ions in an electric field intensity increases in proportion with the stage , so the impact of the electric field strength of the insulation resistance coefficient reflects not come out , when do puncture test specimen samples when the electric field of the insulation resistance coefficient obviously reflects out. Effect of humidity due to the small conductance large, and the water molecules of the polymer molecule size much smaller than that in the thermal effect of the relative motion of the polymer chain composed of macromolecules HDMI CABLE and section within easy infiltration of water molecules on the polymer , so that an increase in the ionic conductivity of polymer , leaving the insulation resistance decreases. Standard provides a variety of water immersion test wire and cable , such as rubber specimen measuring insulation resistance before soaking for 24 hours, because its purpose is to be encountered in the use of water on the influence of moisture and electrical performance .
Insulation resistance is one of the main electrical performance insulation materials, wire and cable is an important indicator of a product or material , generally require insulation resistance of not less than a certain value. If the insulation resistance value is too low, the line along the wire cable must increase the leakage current , resulting in waste of energy , and electrical energy into heat energy , the thermal breakdown preparation conditions , increase the possibility of thermal breakdown .
2014年1月9日星期四
Talking about the proper use of heating cable
Notes 1 ) heating cable installed thermal power cord factory , not on the ground to avoid damage by sharp objects . Do not touch the hot objects to prevent welding slag splashing into heating cable .
2 ) heating cable power cord plant has very good flexibility, but can not be folded , you need to bend , bend heating cable thickness not less than 6 times the radius .
3 ) heating cable power cord plant RAC CABLE in Shenyang prohibited by heavy blow, because the North miscellaneous electrical heating cable should be re- passing the test , you can use .
4 ) heating cable should be accompanied by heat pipes ( or device ) and fixed tightly to improve heating efficiency . Special nylon cable ties fixed heating use , prohibit the use of combined power cord factory wire .
5 ) non-metallic pipe shall be affixed between the aluminum wall and floor heating cables , used to increase the heat transfer area .
6 ) when the heating cable installation should consider charging cord factory of pipe fittings ( or device ) and the possibility of removal , heating cables do not need to cut . Note that the cable is cut or joint sealing joints .
7 ) per meter pipe heat loss is greater than the total heating cable power cord factory output power , heating cable laying , in order to facilitate disassembly and maintenance .
8 ) flange leakage , wound heating cable should be avoided below it.
9 ) heating cable ducts fixed power cord factory installed safety methods. With the temperature of the material should be selected based on the pipeline .
10 ) Install the heating system must HDMI CABLE be individually qualified electrical test loop plant power cord , and then test to check the heating cable heating conditions . Claim normal , the insulation .
11 ) insulation material should be dry . Wet insulation material not only affects the heating effect, but also heating cable corrosion leads to shortened life, does not include the power cable factory pipe insulation protection layer , snow is wet , it should be dry after construction of the outer protective layer.
After the construction of 12 ) heating system should be in the outer protective layer of the pipe , electric heating obvious signs to draw attention .
13 ) When installing heating cables, bus cables and power connections should seal the other end of a match , the two buses should be shorted .
14 ) Multi- loop heating cable to connect the power cable factory in the same junction box, the car must have insulated isolation to prevent short circuits.
15 ) junction box should be sealed to prevent water from entering .
2 ) heating cable power cord plant has very good flexibility, but can not be folded , you need to bend , bend heating cable thickness not less than 6 times the radius .
3 ) heating cable power cord plant RAC CABLE in Shenyang prohibited by heavy blow, because the North miscellaneous electrical heating cable should be re- passing the test , you can use .
4 ) heating cable should be accompanied by heat pipes ( or device ) and fixed tightly to improve heating efficiency . Special nylon cable ties fixed heating use , prohibit the use of combined power cord factory wire .
5 ) non-metallic pipe shall be affixed between the aluminum wall and floor heating cables , used to increase the heat transfer area .
6 ) when the heating cable installation should consider charging cord factory of pipe fittings ( or device ) and the possibility of removal , heating cables do not need to cut . Note that the cable is cut or joint sealing joints .
7 ) per meter pipe heat loss is greater than the total heating cable power cord factory output power , heating cable laying , in order to facilitate disassembly and maintenance .
8 ) flange leakage , wound heating cable should be avoided below it.
9 ) heating cable ducts fixed power cord factory installed safety methods. With the temperature of the material should be selected based on the pipeline .
10 ) Install the heating system must HDMI CABLE be individually qualified electrical test loop plant power cord , and then test to check the heating cable heating conditions . Claim normal , the insulation .
11 ) insulation material should be dry . Wet insulation material not only affects the heating effect, but also heating cable corrosion leads to shortened life, does not include the power cable factory pipe insulation protection layer , snow is wet , it should be dry after construction of the outer protective layer.
After the construction of 12 ) heating system should be in the outer protective layer of the pipe , electric heating obvious signs to draw attention .
13 ) When installing heating cables, bus cables and power connections should seal the other end of a match , the two buses should be shorted .
14 ) Multi- loop heating cable to connect the power cable factory in the same junction box, the car must have insulated isolation to prevent short circuits.
15 ) junction box should be sealed to prevent water from entering .
2014年1月8日星期三
FAQ some security of electricity cables
How to properly plugged into the outlet ?
Plug the plastic cover with the thumb and middle finger clasped , and then insert it into the socket. Do not touch the conductive " Socket Pin ", which is exposed live parts of electric shock ;
Why can not operate electrical switches or plugs, our hands are wet it?
This is very dangerous , because mini usb cable water is a good conductor of electricity . It can increase the risk of a switch or plug with wet hands when operating an electric shock ;
Why turn off the fluorescent tubes, Xiaoqing shade still issued ?
This may be a wrong connection in the lighting mix between the live and neutral lines . This leads to flashing lights . Should be corrected and re- connect the wires through the registered electrical contractors / workers ;
Why have sound internal distribution boards , and we are using instant electric water heater ?
Take it easy . When the contact is high consumption appliances are operating at a slight noise and heat can be obtained as a normal phenomenon. However, once the sound and heat is great, it should be checked by a registered electrical contractors / workers ;
Existing power enough, if I switch to induction cook?
Residential, rated up to 60A load electricity supply , generally not a problem . But , you know, a lot of older people , or a house, 50 to 60 years of age or over , may only supply less than 30A rating. If Mini HDMI cable the premise of an electric water heater and air conditioning , should be taken to avoid open at least one high- consumption appliances ;
We should turn off the electrical power outage ?
When a power outage occurs , you need to turn off all major appliances . Start some electrical current, in general, can be reached from the normal operating mode to a few times. This may cause the power is restored after a power outage right again overloaded .
It is better to use 110V or 220V electrical yet ?
If the electrical voltage selection , you should choose 220V AC ( Hong Kong household voltage ) to prevent electrical damage , causing a fire hazard ;
What kinds of appliances will need to use a separate power outlet ?
Power consumption of appliances such as air conditioners, electric water heaters , electric floor heating , washer / electric dryer , individual outlets should be installed ;
Plug the plastic cover with the thumb and middle finger clasped , and then insert it into the socket. Do not touch the conductive " Socket Pin ", which is exposed live parts of electric shock ;
Why can not operate electrical switches or plugs, our hands are wet it?
This is very dangerous , because mini usb cable water is a good conductor of electricity . It can increase the risk of a switch or plug with wet hands when operating an electric shock ;
Why turn off the fluorescent tubes, Xiaoqing shade still issued ?
This may be a wrong connection in the lighting mix between the live and neutral lines . This leads to flashing lights . Should be corrected and re- connect the wires through the registered electrical contractors / workers ;
Why have sound internal distribution boards , and we are using instant electric water heater ?
Take it easy . When the contact is high consumption appliances are operating at a slight noise and heat can be obtained as a normal phenomenon. However, once the sound and heat is great, it should be checked by a registered electrical contractors / workers ;
Existing power enough, if I switch to induction cook?
Residential, rated up to 60A load electricity supply , generally not a problem . But , you know, a lot of older people , or a house, 50 to 60 years of age or over , may only supply less than 30A rating. If Mini HDMI cable the premise of an electric water heater and air conditioning , should be taken to avoid open at least one high- consumption appliances ;
We should turn off the electrical power outage ?
When a power outage occurs , you need to turn off all major appliances . Start some electrical current, in general, can be reached from the normal operating mode to a few times. This may cause the power is restored after a power outage right again overloaded .
It is better to use 110V or 220V electrical yet ?
If the electrical voltage selection , you should choose 220V AC ( Hong Kong household voltage ) to prevent electrical damage , causing a fire hazard ;
What kinds of appliances will need to use a separate power outlet ?
Power consumption of appliances such as air conditioners, electric water heaters , electric floor heating , washer / electric dryer , individual outlets should be installed ;
2014年1月6日星期一
Aluminum alloy cable cable 5 big performance
Safety performance aluminum cable : Performance of a
1 , history proved 3 , aluminum alloy composition effect ;
After adding rare earth alloy conductor components and iron and other ingredients, greatly improved the performance of its electrical properties and connections , especially when you add iron to produce annealed conductor creep resistance of high strength , when current overload, iron play continued connecting role in making aluminum conductor creep does not occur.
Creep great harm to the cable , if Terminal BLOCK the cable creep , its original point of contact pressure is not tight enough , the pressure is reduced so that the contact resistance increases rapidly after the current flow caused by overheating of the joints , if unscheduled maintenance, there will be security risks . Is very important to solve the problem of cable creep .
Creep: metal temperature , force and its own weight , over time , permanent deformation will not be slow to recover , the phenomenon of creep.
Flame retardant
Aluminum retardant cable insulation materials using silane cross -linked polyethylene (XLPE), the use of self-locking armored structure, thermal performance is far superior to PVC jacket material can rapidly heat the process, the flame disappears quickly extinguished the flames , then do not delay other materials , very excellent flame retardant properties . Aluminum cable using new materials and new technology , to ensure its use more secure.
Performance II: Electrical properties of aluminum cable
1, the cross-sectional area cable ampacity copper alloy conductors are 1.5 times the copper alloy conductors and mini usb cable electrical properties as a conductor to achieve the same carrying capacity , resistance, and pressure loss .
The resistance between the aluminum alloy of aluminum and copper, aluminum slightly higher , but lower than copper , provided at the same flow cross section , the weight of the aluminum alloy conductor of equal length is only half the copper . If the conductivity of the copper at 100 %, the conductivity of the conductor is about 61.2% of the alloy , the proportion of the alloy is 2.7 , the proportion of copper is 8.9 , the (8.9/2.7) × (0.612 / 1) = 2, i.e., 2 the unit weight of the same alloy with a resistor of resistance of copper per unit mass , so that when the cross-sectional area of the alloy is 1.5 times that of copper conductors is the same as the electrical properties , i.e. to achieve the same cross-sectional flow and copper , resistance, and voltage loss.
1 , history proved 3 , aluminum alloy composition effect ;
After adding rare earth alloy conductor components and iron and other ingredients, greatly improved the performance of its electrical properties and connections , especially when you add iron to produce annealed conductor creep resistance of high strength , when current overload, iron play continued connecting role in making aluminum conductor creep does not occur.
Creep great harm to the cable , if Terminal BLOCK the cable creep , its original point of contact pressure is not tight enough , the pressure is reduced so that the contact resistance increases rapidly after the current flow caused by overheating of the joints , if unscheduled maintenance, there will be security risks . Is very important to solve the problem of cable creep .
Creep: metal temperature , force and its own weight , over time , permanent deformation will not be slow to recover , the phenomenon of creep.
Flame retardant
Aluminum retardant cable insulation materials using silane cross -linked polyethylene (XLPE), the use of self-locking armored structure, thermal performance is far superior to PVC jacket material can rapidly heat the process, the flame disappears quickly extinguished the flames , then do not delay other materials , very excellent flame retardant properties . Aluminum cable using new materials and new technology , to ensure its use more secure.
Performance II: Electrical properties of aluminum cable
1, the cross-sectional area cable ampacity copper alloy conductors are 1.5 times the copper alloy conductors and mini usb cable electrical properties as a conductor to achieve the same carrying capacity , resistance, and pressure loss .
The resistance between the aluminum alloy of aluminum and copper, aluminum slightly higher , but lower than copper , provided at the same flow cross section , the weight of the aluminum alloy conductor of equal length is only half the copper . If the conductivity of the copper at 100 %, the conductivity of the conductor is about 61.2% of the alloy , the proportion of the alloy is 2.7 , the proportion of copper is 8.9 , the (8.9/2.7) × (0.612 / 1) = 2, i.e., 2 the unit weight of the same alloy with a resistor of resistance of copper per unit mass , so that when the cross-sectional area of the alloy is 1.5 times that of copper conductors is the same as the electrical properties , i.e. to achieve the same cross-sectional flow and copper , resistance, and voltage loss.
2014年1月3日星期五
Specialty wire and cable status and development trend analysis
In recent years , China's optical cable market at 15% to 20 % annual rate of increase, the position of the wire and cable industry in China's machinery industry is the second largest after the automobile industry, China is also the second in the world after the U.S. largest wire and cable producer. However, the recent global wire and cable market matures , wire and cable manufacturing industry slowed down, modest growth . As the impact of changes in the external environment and the internal HDMI CABLE competition , the world's wire and cable industry has entered several giant monopolistic competition pattern in the world put the whole family aspect . Although the number of Chinese local manufacturers up to more than 7000, but almost all concentrated in low areas on low prices to snatch market , which has become the bottleneck of the development of domestic enterprises. Currently in profit margins of high-end cable areas , the Chinese market is completely preempted multinational giants .
Due to intense competition , the major manufacturers of wire and cable industry, primarily to reduce costs through a variety of ways to control fixed costs . With the entry of multinational companies , low-cost competition in China's cable industry will face a severe test. China wire and cable market acceptance for special cables open attitude as long scrimmage at the low end of the domestic cable companies provide a way of escape , and like the spring breeze blowing head for the wire and cable industry, this " dying patient" a needle into the "tonic . "
Currently, the market sales of specialty cable domestic cable market accounted for about 30% of total sales , according to a rough estimate of the annual sales of the specialty cable products for about 400 billion yuan. Specialty cable products market demand for our division put up a huge and elaborate stage , we need to hold their own , to develop, to hdmi wall plate the occupation. In ordinary products competitive, profitable today, why not focus on the development of specialty cable products in the era of rapid development of specialty cable products , the emergence of a group will be a veritable high-tech wire and cable business . 2 What is special cable ?
Nowadays, more and more special cable saying , specialty cable seems increasingly popular. But what is special cables , special cables , including those products , it appears that not everyone is clear. Someone said: " In addition to the standard requirements of the eight children of the power cables, communication cables and other cables are special cables ." Some plants said to be the control cable special cable , this argument is correct, I'm afraid most people could not make conclusions , have the final say experts .
Still no expert on what is an exact definition of specialty products under . Seen from the promotional materials , people can only transmit signals without power and communication with any other auxiliary functions and performance of the product , known as traditional products , but to also have special accessibility features and performance of the product , called Specialty Products . Is a series of specialty wire and cable products with unique properties and special structure , the equivalent of a wide range of large common wire and cable , has the high technology content , the more stringent conditions of use , small -volume, high -value-added features. Often using new materials, new structures, new technology and new design calculations. For example with the " anti- ... " and " resistance ... " products as well as some special products, is a typical specialty products. Due to its special cables use the occasion of the special nature of its performance compared with conventional cables have special requirements, such as : high temperature , low temperature, vertical or radial pressure tightness ( air or water ) , ultraviolet light , ozone, lubrication or fuel oil , special flux , bending, flexing , tensile, compressive , strong electric or magnetic field interference, corona , radiation , fire , fire , etc.
Due to intense competition , the major manufacturers of wire and cable industry, primarily to reduce costs through a variety of ways to control fixed costs . With the entry of multinational companies , low-cost competition in China's cable industry will face a severe test. China wire and cable market acceptance for special cables open attitude as long scrimmage at the low end of the domestic cable companies provide a way of escape , and like the spring breeze blowing head for the wire and cable industry, this " dying patient" a needle into the "tonic . "
Currently, the market sales of specialty cable domestic cable market accounted for about 30% of total sales , according to a rough estimate of the annual sales of the specialty cable products for about 400 billion yuan. Specialty cable products market demand for our division put up a huge and elaborate stage , we need to hold their own , to develop, to hdmi wall plate the occupation. In ordinary products competitive, profitable today, why not focus on the development of specialty cable products in the era of rapid development of specialty cable products , the emergence of a group will be a veritable high-tech wire and cable business . 2 What is special cable ?
Nowadays, more and more special cable saying , specialty cable seems increasingly popular. But what is special cables , special cables , including those products , it appears that not everyone is clear. Someone said: " In addition to the standard requirements of the eight children of the power cables, communication cables and other cables are special cables ." Some plants said to be the control cable special cable , this argument is correct, I'm afraid most people could not make conclusions , have the final say experts .
Still no expert on what is an exact definition of specialty products under . Seen from the promotional materials , people can only transmit signals without power and communication with any other auxiliary functions and performance of the product , known as traditional products , but to also have special accessibility features and performance of the product , called Specialty Products . Is a series of specialty wire and cable products with unique properties and special structure , the equivalent of a wide range of large common wire and cable , has the high technology content , the more stringent conditions of use , small -volume, high -value-added features. Often using new materials, new structures, new technology and new design calculations. For example with the " anti- ... " and " resistance ... " products as well as some special products, is a typical specialty products. Due to its special cables use the occasion of the special nature of its performance compared with conventional cables have special requirements, such as : high temperature , low temperature, vertical or radial pressure tightness ( air or water ) , ultraviolet light , ozone, lubrication or fuel oil , special flux , bending, flexing , tensile, compressive , strong electric or magnetic field interference, corona , radiation , fire , fire , etc.
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